diff --git a/src/conf.c b/src/conf.c
index f44e684..ab089e7 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -676,7 +676,7 @@ conf_write_impl(const conf_t *conf, void *fp, size_t bufsz,
 bool_t
 conf_write(const conf_t *conf, FILE *fp)
 {
-	return (conf_write_impl(conf, fp, 0, B_FALSE, B_FALSE));
+	return (conf_write_impl(conf, fp, 0, B_FALSE, B_FALSE) >= 0);
 }
 
 /**